Headscratchers / Atomic Puppet

• In "Pizza Planet", AP says that he doesn't believe in aliens because he's never met any. Later we learn in "Bend It Like Joey" that back when he was Captain Atomic, he and the Justice Alliance would play soccer against aliens on an annual basis to stop them from eating everyone on Earth. Anyone got an explanation?
  • He probably thought they were just people in costumes. Kinda like Zombie Walks.